phil armitage, stony brook


WELCOME to the web site of Phil Armitage at Stony Brook University. I'm interested in using numerical simulations to understand the physics of protoplanetary disks, the formation of extrasolar planets, and the astrophysics of black holes. Topics of recent interest incude the formation of planetesimals, the accretion of planetary envelopes, and the use of machine learning for theoretical studies of planetary dynamics. I currently divide my time between Stony Brook and the Center for Computational Astrophysics at the Flatiron Institute, where I lead the planet formation group.

Simulation of accretion disk turbulence, by Jake Simon
Recent papers
A Bayesian neural network predicts the dissolution of compact planetary systems, M. Cranmer et al., submitted

Boundary layer circumplanetary accretion: How fast could an unmagnetized planet spin up through its disk?, J. Dong, Y.-F. Jiang, & P.J. Armitage, ApJ, submitted

Visualizing the kinematics of planet formation, Disk Dynamics Collaboration, PASA, submitted

Kozai-Lidov oscillations triggered by a tilt instability of detached circumplanetary discs, R.G. Martin, Z. Zhu, P.J. Armitage, C.-C. Yang, & H. Baehr, MNRAS, 502, 4426 (2021)

Turbulence regulates the rate of planetesimal formation via gravitational collapse, D.A. Gole, J.B. Simon, R. Li, A.N. Youdin, & P.J. Armitage, ApJ, 904, id. 132 (2020)

Survivor bias: Divergent fates of the Solar System's ejected versus persisting planetesimals, S.N. Raymond, N.A. Kaib, P.J. Armitage, & J.J. Fortney, ApJL, 904, id. L4 (2020)

Local simulations of heating torques on a luminous body in an accretion disk, A. Hankla, Y.-F. Jiang, & P.J. Armitage, ApJ, 902, id. 50 (2020)

A fast-growing tilt instability of detached circumplanetary disks, R.G. Martin, Z. Zhu, & P.J. Armitage, ApJL, 898, id. L26 (2020)

Predicting the long-term stability of compact multiplanet systems, D. Tamayo et al., PNAS, 117 (31), 18194 (2020)

Simulation of a compact object with outflows moving through a gaseous background, X. Li, P. Chang, Y. Levin, C.D. Matzner, & P.J. Armitage, MNRAS, 494, 2327 (2020)

Strongly magnetized accretion disks: structure and accretion from global magnetohydrodynamic simulations, B. Mishra, M.C. Begelman, P.J. Armitage, & J.B. Simon, MNRAS, 492, 1855 (2020)

Reviews and notes
The influence of black hole binarity on Tidal Disruption Events (Coughlin et al., Space Science Reviews, 215, article id. 45, 2019)

Physical processes in protoplanetary disks (Armitage, 45th Saas-Fee Advanced Course "From Protoplanetary Disks to Planet Formation")

A brief overview of planet formation (Armitage, short introduction for the Handbook of Exoplanets)

The dispersal of protoplanetary disks (Alexander et al., Protostars and Planets VI, 2014)

The long-term dynamical evolution of planetary systems (Davies et al., Protostars and Planets VI, 2014)

Dynamics of protoplanetary disks (Armitage, ARA&A, 2011)

Lecture notes on the formation and early evolution of planetary systems (arXiv only)


Personal I did my undergraduate and graduate work at the University of Cambridge, working with Cathie Clarke at the Institute of Astronomy as my primary advisor. I was a postdoc at CITA and MPA, a lecturer at St Andrews, and a professor at the University of Colorado (2002-2018) before moving to New York.

Beyond work I enjoy hiking, often combined with photography. My main focus is landscapes, but over the years I've also made trips to photograph bears in some spectacular spots in Alaska.

Philip Armitage